fix: gps.php - Replace $_POST to $_REQUEST, 'cause it will also to take GET-request.
code reading improvement
Revert to default param
Fill accuracy column on GPSLOG table.

GPSLOG table have a ACCURACY column, but it's not using from code.
Merge pull request #24 from palacex/master

minor fix gps.php to get gps coordinate from GPS device through http-GET request.